Mitochondrial proton leak in cardiac aging

• Published in: GeroScience Vol. 45; no. 4; pp. 2135 - 2143
• Main Authors: Qi, Xingyun, Rusch, Nancy J., Fan, Jiaojiao, Mora, Christoph J., Xie, Lixin, Mu, Shengyu, Rabinovitch, Peter S., Zhang, Huiliang
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-08-2023; Springer Nature B.V
• Subjects: Adenosine Triphosphate - metabolism; Aging; Biomedical and Life Sciences; Cardiomyocytes; Cell Biology; Congestive heart failure; Coronary artery disease; Geriatrics/Gerontology; Heart diseases; Ion Channels - metabolism; Life Sciences; Life span; Mitochondria; Mitochondria - metabolism; Mitochondrial Proteins - metabolism; Molecular Medicine; Myocytes; Original Article; Oxidative phosphorylation; Phosphorylation; Protons; Heart failure; Pleiotropic role; Mitochondria; Proton leak; Adenine nucleotide transporter 1; Cardiac aging
• ISSN: 2509-2723; 2509-2715; 2509-2723
• DOI: 10.1007/s11357-023-00757-x

Age-associated diseases are becoming progressively more prevalent, reflecting the increased lifespan of the world’s population. However, the fundamental mechanisms of physiologic aging are poorly understood, and in particular, the molecular pathways that mediate cardiac aging and its associated dysfunction are unclear. Here, we focus on certain ion flux abnormalities of the mitochondria that may contribute to cardiac aging and age-related heart failure. Using oxidative phosphorylation, mitochondria pump protons from the matrix to the intermembrane space to generate a proton gradient across the inner membrane. The protons are returned to the matrix by the ATPase complex within the membrane to generate ATP. However, a portion of protons leak back to the matrix and do not drive ATP production, and this event is called proton leak or uncoupling. Accumulating evidence suggests that mitochondrial proton leak is increased in the cardiac myocytes of aged hearts. In this mini-review, we discuss the measurement methods and major sites of mitochondrial proton leak with an emphasis on the adenine nucleotide transporter 1 (ANT1), and explore the possibility of inhibiting augmented mitochondrial proton leak as a therapeutic intervention to mitigate cardiac aging.